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This is really strange! I restarted the mission and this time the first key wasn't on his place so I didn't find it. And another key disappeared again after using it. Is this a bad joke? Perhaps a conspiracy? (Because the walkthrough doesn't work )
Please help, I'm losing my mind

Many of the objects are randomly placed around the world (random between a few designated possibilities), so as to add replay value. Yes, they keys get "used up", I actually liked it because it kept my inventory uncluttered.